Messages in this thread | | | Date | Tue, 3 Oct 2006 20:36:20 -0700 | From | Andrew Morton <> | Subject | Re: [patch] clockevents: drivers for i386, fix #2 |
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On Tue, 3 Oct 2006 12:35:03 +0200 Ingo Molnar <mingo@elte.hu> wrote:
> > add back a mistakenly removed udelay(10) to the PIT initialization > sequence. > > Signed-off-by: Ingo Molnar <mingo@elte.hu> > --- > arch/i386/kernel/i8253.c | 1 + > 1 file changed, 1 insertion(+) > > Index: linux/arch/i386/kernel/i8253.c > =================================================================== > --- linux.orig/arch/i386/kernel/i8253.c > +++ linux/arch/i386/kernel/i8253.c > @@ -45,6 +45,7 @@ static void init_pit_timer(enum clock_ev > outb_p(0x34, PIT_MODE); > udelay(10); > outb_p(LATCH & 0xff , PIT_CH0); /* LSB */ > + udelay(10); > outb(LATCH >> 8 , PIT_CH0); /* MSB */ > break; >
Doesn't help.
> * Ingo Molnar <mingo@elte.hu> wrote: > > > yeah, i suspect it works again if you disable: > > > > CONFIG_X86_UP_APIC=y > > CONFIG_X86_UP_IOAPIC=y > > CONFIG_X86_LOCAL_APIC=y > > CONFIG_X86_IO_APIC=y > > > > as the slowdown has the feeling of a runaway lapic timer irq. > >
Disabling IO_APIC doesn't fix the slowdown.
Disabling LOCAL_APIC does fix it. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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